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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05127426c7f46490c20f55fd43a47999f5b2fad8de7de9a8c84b719d6f66a0f5' 
  AND token = '8AHEeeAK+BhNrZ0Yhd9AHf4nVe6GA8eK7kys86FzZmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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