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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31883e49ce803e6bcb0e43693a755d9b7fd3645010c788905c3d0fc82d5fec71' 
  AND token = 'DUR1E4/tY7dbyMZVTQv2ezUhCraW3p0XEunM03NyHgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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