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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c870bec1a10179ab2db1afb94641c62f266552c8f99ec530c701344065ed576' 
  AND token = 'bkFGH6HQV5wh69/znMwrUfJODMFe7s7FaoDJxYYNPNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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