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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00b13969bdf9db072fd6ae3e69553f3d5206cf2c8a27c3e3167c5f3f1a030f9' 
  AND token = 'uZeSQiKcd7lo43M7PDT83kZhgcAQvZ9fDdPWmSOgUn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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