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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ba8c4823c9c8bf0de963961c5062f721db0453c3f683898371a2225befd2c9' 
  AND token = 'Qd9ZRF/TcWC3SffjMf7KMOaPWmgVJRSzC653LK8H9x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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