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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cba2500e4f5b01a996be24cad6dcda242b858caef3d4557e72b0f33257fcb70' 
  AND token = 'QTg5vnx4+W8xIUj4mDa9v/YqCTRm/n1i5+BSPTIWC9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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