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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4db7dbbfd33562bd47975a70a140fac8eba1ef95f81748c74cbeda5ba9738a' 
  AND token = '4H714DiTX9QE1nhSx6VyM8VTsOPdej6+bb809lavDbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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