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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23170cfec7eebf404c8c1ff5359d0e2dcc35645633c542eee83d94a9c43f40aa' 
  AND token = 'tyHAw3VsHcBGsIRsliwhMhMOMSI+cTriSqLSZ50Y5Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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