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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb779b5a93e1f27083a0c9411e5065363bca4383e7aec3f5ad7880226ebf364' 
  AND token = 'dopoxGlcagq0T33qy2+KNXk7gu0BeJStL7ZSSWu0BAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}