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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b744b9c1165fbdafb64b65d7b018aa896111a989d024d80e3c2652ec2c2abe' 
  AND token = '5BXJHwfUV1ulCweXKNwnPcAQqoVS69Ts5XyTANW3X4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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