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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2328d3968b80b5d04ddd58d66d64ff7563b8efc215ed1fcb55eaed064eb799' 
  AND token = 'dvM8ndMmbPfwn0O7sBi2vwK8RioN/jNwARXlTrZHMDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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