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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a24a1c7f8d684455f50dc1415305de97dbb7aeb57c655fd5634aaf750f00df' 
  AND token = '46Z4UeWW6R4ZdPO3nZGLGuLVl2EK8M1CREJHsLdqiKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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