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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3b0da0978a693de5c78e79c18ae793f54c39dbc4cdd28f27b8b0cfeaa891d0' 
  AND token = 'NOMXxgQp/JcwzWqLbbxUQTbtMwC5bHnCZbbo9Fgh05c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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