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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926afe217e6328784491615a8435ae2d95623860b5d3fa212878ec1682f563d5' 
  AND token = 'ZCIOA+iY3XZbfUc2WLYYt20iQBrEAG6UWfg+ifEhUHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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