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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5325c9f7cf7cf037fab8bae9dfa1f57c639fcc53ba2b9b6ea2ced8f8e82d09f' 
  AND token = 'oByM7a7GhPV/pjCTfgemjUdu9Z/sHFNhFf3+94DZvec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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