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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c97863fb4a3ce01be1836dc8f83514f30fa82f8561585e70cb189cca4f47dbc' 
  AND token = 'ikoGW2+pv4+rTcEDLkmMuwQDfhBXhOF220Dd2YKL3Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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