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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963da9599b15816b2ae1d0c0b6d15e38dc770dcd2dbbc435dccbb3cbbfa308fa' 
  AND token = '4OUVhbd4XYqEUWOCxWHMbmQklFtyt/yfSH+gnYil0is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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