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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa715d343c258c3f773bd04dc4316bc31f44cc6b1b2db38eed1a4376b3012e8' 
  AND token = '46V4aC85fHNUgdfei6eDEfhjFW0VY+N8iLyFJwIxMuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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