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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d9bdd25e6e71bd659ed01db9b47d5d1c8f5a8f77ea8f1100843dfbe21c8978' 
  AND token = 'jBdIoZ9nXhKj9uFAJrT2EEd7E/WM49kn9RPRQVK6q78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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