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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd871dbd499083b920bd8bf4fb2c1cac421c969f9d338f018aabebbd8524e7931' 
  AND token = 'm//2DSx+zyXhCK5EG8A2pfHR2DJ4EWCXDFY6oaApAk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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