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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12e536d0ec7b580415f7ad74407ff0c5c9b6626c256e800bc04c11fb15e6836' 
  AND token = '7MoDcv7SrmfbAte2lFGkymjj6YbB2Jt/T26ykM5la9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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