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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e348288cd5bb21221b83e06e0ad8ea789b58ac9ac39991792d9ad9d9c7e96d' 
  AND token = 'y93FMG9Bc4JR7VCJrP7oFZ6pNKC7Q8sN81+ESiWDx5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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