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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58568ad666c94b9ba546e88ffe18b4297219887987b435edf51aa0361b2a7fe6' 
  AND token = '+D4cnsKT69WyZIKhxIWFBnx5BLX8N6rRpqqaGgoxARM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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