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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4702d3583acc514af68db05b2b392a15a64e3d94bc9f7e35b78f9a9ef621cdd7' 
  AND token = 'Rjh/IrMJt8/4L41csFAPyWuYJuw2w5eP05wkUZM/TUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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