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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72e5a1558bbab06de9c353921632e9dfdde233b7dd11d1e4696e6d6bf87c9fd' 
  AND token = 'TinFTEQ/dgLgJeWr94amOoQVCBKe2bgHgdeXd6Jm+Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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