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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf336a08efb048bd9c69f90a9518d8c7ee1bf20cd1a9c0b3a4c3b1474fc4d2e' 
  AND token = 'dmvrC0an5FwgmmT/Xm9iOaeVmJQPEwfxZn9IgfrBRn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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