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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8592b28688776a1d8c880b62f153e84099fa7561ee4bad0d89cefa07e1fe1b4c' 
  AND token = 'zm2ziaIpDcqqf2vGZ8G3Gugy7wfHGKTDolbcBFyz5rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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