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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3b91dae1d0344469304839723deb78ae2e837c19c75c6feb623e8c5cd270e4' 
  AND token = '1wcZTXcZtsFgc2xGp+v8jw79ToOYG52xygtjN9xBUkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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