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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9076d250fdcf3b6468f42159a507aa2da67dfe3cef470a46318290aedada6862' 
  AND token = '9aphinBbHRpTcQ2iCIm3PBfvTSwHg/2neA6PTzFpM3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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