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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d0451beea2f61fd079bfd3698b4012f448ef618c0976e4d8768936f8841600' 
  AND token = 'tIbG7HEPPe97XoOFmjEochsF+SGZ8qy1ysvebguA/4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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