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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa7d68b39c7d3c58183cb9ab452279522579746b833a80dc23f0fe15983702d' 
  AND token = 'LjsEIW4H7Ltky2ZTDX0wxP8VrTtdKxQx/0vdSBxSFmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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