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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a0273ef10770cfd0dc93f7a9f49138c94438a96e93aa149d88a7578ddb419f' 
  AND token = '/vBdeB/45SeOt0pTDgHE70SoHdGsifZ2SAAhRxihaQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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