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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee2db1b016074c4feb9c3dff73a7d2700fed151d7c31264b1a5c6c3972dd3fe' 
  AND token = 'PpwRSFxIFGLvJgWcyiJ1Zun7w+xbIie8FpeFFTy3PJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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