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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b886cc30e7c84829322ef231c6024d43db05b97a3803170df0af32435e8f5478' 
  AND token = 'ktZNLPNbdN/ZY/hBeq+xgSvS7vCNZUO25ahTV951o8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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