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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee52b7f9fbd28fc7c8f4adfd2842ee72203ac684194eb11b53e51932a92a6e76' 
  AND token = 'vf4O9/4rQyb5/yCd8ndPwSel+0UEvyuh834LIJ6MrTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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