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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad76ec8de810c6209f18943cf1c29ed894a7e73c4b39d4bb233eecbc42d11d9' 
  AND token = 'H5IdLfNtCOGStr4VPV5N7L/87Ax+c0RaLANNLNRFXXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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