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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589b531242e4c2883a2118026f36c3f7532d7c59886a82a3d7aec7cb8ec43f6b' 
  AND token = 'IuOC8tZ5yblnink57G6WSDJOiNEQvFovARU3PK/gd+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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