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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6a7ae0666b7f2958da2a85bed95e082669575ec38ad5f44209f89bcfd375a5' 
  AND token = 'F3Tc1okuph2QR3m02ofpTmgHQHSj6khEAmqutNUv2MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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