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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee9397cded559e29c9851792fff96422978763e2323fa4948d9da31ed3f7c77' 
  AND token = 'QJo6DbQtZNa8Zks+qnCBa+D1yHlZeGZMLSSeZXau6gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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