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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fed79b975aa9aaf518558dbdc7acd1fc02d0f206b3ad63799184a614a4165bd' 
  AND token = 'i0AWM4z7CNUoy7Udl4MYoWZAg+L6xgGIqMo029gpxzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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