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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f530d4341d4a26d2b05a90a128501c32f625bd123eef1df80c6cf16c1e2d79d' 
  AND token = 'h65/fuU/ic9b86iRcksYnV94YDSJ0FwWcQXXN/khyc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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