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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e81304e48a0b6e0b80e9681d4807cf25cd17a35dd03dcd9076c0d1ac3ec4f9' 
  AND token = 'savxUDC9nyrBhdJnC/MxxSSxCG8RMwKlsKW0YOzEaI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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