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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79933536fa26b5b2eb0527ec1882b2b399036fc247ba7f71108614e7b7ff44b7' 
  AND token = 'bVzm0LDQSiwePhDasd9J0NUNyETiuXitoQxutTJlCOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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