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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62cd7608efcad390742f98454ff60d0626b71137b2d6a5075ed75a1005bdaf16' 
  AND token = 'yBZk9RPQ9kxz7wuba24ZGABNK8bOKAws8NL2TjejQb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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