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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664d3071648990be7fc2bb5f4e526c458283b78ee3ac4f7aad93f3b9438207d0' 
  AND token = 'gsrgbfMSux67dyXEY7LGekoU0DCSvuS7oCBJH32PVPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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