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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef93944fa603dfea3bd6241f306a1a35636d1bffa5ad413166c2ab58c78eb388' 
  AND token = 'WHrISmuNYuWLNuqclCBE5rft980hcz6U77/j5C0gpBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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