SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1863da3777feb067787ffd2fce558640b0cf582455389750d572f4e4d93c8a' 
  AND token = 'IZ5RSohG8UsNQXlUSogy2HPq4VhyYx3mWvwPMzRJPyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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