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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b7c03b6489370a770e9a62d09805dac0a560c94fb48266a6d47583fd6f7517' 
  AND token = 'fjeDr3GUo7WG6qOoUsES7Pj72LH/YTG4IMc/DrM38cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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