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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba296aec2b9e0a47f8b6b3841123b12a6a5a0cba5eafe4e951b32716ec875c38' 
  AND token = 'kqOtSEtYD2Qcj+2YISpUYcwlSCX2atz8UafViOo7blw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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