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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172b87e891cb1f72cd9c97413cf6b52f1e3c65345dd6c139ed634a23e9ed01f9' 
  AND token = '1xrgUdUvcnbYD6k6rD3z0Asa+MxIBPOIhQnkP4+22UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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