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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872f47a2369db147a3a43d34e0f25d7bf7017772336a799260e363a42f1d51a9' 
  AND token = '0BtlcUDONPUFIxOgH5svTP+44eAQzinwbg2HRCADtcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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