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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9609353a4fc55a4620612d5b454f95dfe4f44c951da027d804e408c57adf6e' 
  AND token = 'lrZWi/4ATvfl9cGwE+dhgOTXBfVLGfsfNkQQcjV14nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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