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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718b009757911526b59ed5c80ca8b5fc2a49f4227bb402c44ab0d571bfad76e9' 
  AND token = 'D6+NQlSUTMyz15xJL3qQntfHSRT/z50LmOeLdrQpd0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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